在Javascript中讀取對象內的對象的值

Question

我創建了一個如下所示的關鍵值映射，deMapping包含來自不同來源（如RBSK等）的數據。 現在我想讀取RBSK和其他來源中的所有值，並希望在foreach循環，如： deMapping.forEach（功能（數據）

var deMapping = { 
 
    RBSK: {'dsUID': 'tdTwLUxcQ8R', rootNodeName: 'RBSK_GIS_Indicator', orgUnitTagName: 'MCTSCode', des: [ 
 
     { 
 
      xmlid: "Childhood_Diseases_0_6_Female", 
 
      dataElement: "oV163sbcJ0N", 
 
      categoryOptionCombo: "Cmzbo9LD8pJ" 
 
     }, 
 
     { 
 
      xmlid: "Childhood_Diseases_0_6_Male", 
 
      dataElement: "oV163sbcJ0N", 
 
      categoryOptionCombo: "PnAVAPG4yvb" 
 
     }, 
 
     { 
 
      xmlid: "Childhood_Diseases_7_18_Female", 
 
      dataElement: "cEPledgs7rd", 
 
      categoryOptionCombo: "Cmzbo9LD8pJ" 
 
     }, 
 
     { 
 
      xmlid: "Childhood_Diseases_7_18_Male", 
 
      dataElement: "cEPledgs7rd", 
 
      categoryOptionCombo: "PnAVAPG4yvb" 
 
     }, 
 
     {xmlid: "Deficiencies_0_6_Female", dataElement: "gKupqkIhW4n", categoryOptionCombo: "Cmzbo9LD8pJ"}, 
 
     {xmlid: "Deficiencies_0_6_Male", dataElement: "gKupqkIhW4n", categoryOptionCombo: "PnAVAPG4yvb"}, 
 
     {xmlid: "Deficiencies_7_18_Female", dataElement: "FuEnn0bLuoT", categoryOptionCombo: "Cmzbo9LD8pJ"}, 
 
     {xmlid: "Deficiencies_7_18_Male", dataElement: "FuEnn0bLuoT", categoryOptionCombo: "PnAVAPG4yvb"}, 
 
     { 
 
      xmlid: "Developmental_dealy_and_disability_0_6_Female", 
 
      dataElement: "v37HBq7C72j", 
 
      categoryOptionCombo: "Cmzbo9LD8pJ" 
 
     }, 
 
     { 
 
      xmlid: "Developmental_dealy_and_disability_0_6_Male", 
 
      dataElement: "v37HBq7C72j", 
 
      categoryOptionCombo: "PnAVAPG4yvb" 
 
     }, 
 
     { 
 
      xmlid: "Developmental_dealy_and_disability_7_18_Female", 
 
      dataElement: "S1WMlAKnF8Z", 
 
      categoryOptionCombo: "Cmzbo9LD8pJ" 
 
     }, 
 
     { 
 
      xmlid: "Developmental_dealy_and_disability_7_18_Male", 
 
      dataElement: "S1WMlAKnF8Z", 
 
      categoryOptionCombo: "PnAVAPG4yvb" 
 
     }, 
 
     { 
 
      xmlid: "defect_at_birth_0_6_Female", 
 
      dataElement: "JJO3utHjb3l", 
 
      categoryOptionCombo: "Cmzbo9LD8pJ" 
 
     }, 
 
     {xmlid: "defect_at_birth_0_6_Male", dataElement: "JJO3utHjb3l", categoryOptionCombo: "PnAVAPG4yvb"}, 
 
     { 
 
      xmlid: "defect_at_birth_7_18_Female", 
 
      dataElement: "qoVmtykHboz", 
 
      categoryOptionCombo: "Cmzbo9LD8pJ" 
 
     }, 
 
     {xmlid: "defect_at_birth_7_18_Male", dataElement: "qoVmtykHboz", categoryOptionCombo: "PnAVAPG4yvb"} 
 

 

 
    ] 
 
    } 
 

 

 
}

Answer 1

deMapping是一個對象，所以你不能在它上面運行forEach

。

取而代之的是尋找(var prop in deMapping)for...in（並根據需要嵌套您包含的每個對象的循環）。

for (var prop in deMapping) { 
    var subObj = deMapping[prop]; 
    for (var subProp in subObj) { // subObj is what you call RBSK, we are looping on it now 
     console.debug(subProp, ":", subObj[subProp]); // will output 'dsUID': 'tdTwLUxcQ8R', rootNodeName: 'RBSK_GIS_Indicator', ... at each loop 
    } 
} 

隨着ES6，你也可以使用for...of方法，在對象，字符串，工作...

編輯： 訪問des財產和迭代的對象，然後遍歷對象本身的屬性。

for (var prop in deMapping) { 
    var subObj = deMapping[prop]; 
    for (var subProp in subObj) { // subObj is what you call RBSK, we are looping on it now 
     if (subProp === "des") { 
      subObj[subProp].forEach(function(resObj) { 
       for (var prop in resObj) { 
        console.debug(prop, ":", resObj[prop]); 
       } 
      }); 
     } 
    } 
}